S.D. Codified Laws § 39-1-11
All proprietors, clerks, bookkeepers, or other persons in any way dealing in any product governed by this title and all express agents and all employees of railroads or other common carriers shall render to the secretary of agriculture and natural resources, the secretary of public safety, and their authorized assistants all aid within their power in discovering any such products which may be suspected of being in violation of this title, and all records appertaining thereto. Any refusal or neglect on the part of such proprietors, clerks, bookkeepers, or other persons in any way dealing in any such product, or any express agent or employee of a railroad or other common carrier, to render such friendly aid shall be a violation of this title and shall be punishable as provided in § 39-1-8.
SDCL 39-1-11